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I've been reading about the relationship between celiac disease and
lymphoma.  I know the chances of getting it are greater if you don't
stay on a strict GF diet.

My question is:

How do dr's rule out lymphoma?

I've been GF for over a year  (I don't cheat) and I'm not getting any
better.

I'm trying to figure out what else this could be. I know it doesn't
necessarily have to be lymphoma, but I need to know.  Would a cat-scan
be definitive?  Is there any other test?

Thanks.